Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says: A man left from Khaybar, two men started following him, and there was another behind them who was telling them: "Return, return." (Until) he made them return, then he joined the first man and informed him that those two were devils, I kept following them until I made them return. When you reach the Messenger of Allah (peace and blessings be upon him), convey my greetings to him and inform him that I am collecting charity here; if you (O Prophet) are worthy of it, we will send it. That man reached Madinah and conveyed his message to the Prophet (peace and blessings be upon him). At that time, the Prophet (peace and blessings be upon him) forbade seclusion (being alone).